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Freeing up a serial port with a modem connected

 
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Old 01-16-2008
Question Freeing up a serial port with a modem connected
I currently access a remote Unix server which has an external modem connected to one of it's serial ports (/dev/cua/b). At times, this server undergoes a hard reset and for some reason this disallows us from making use of the modem any longer. A hard reset of the modem always seems to fix the problem, however I was wondering if there was anything I could do from my x-terminal to "kick or free-up" the port/modem. When I issue the tip /dev/cua/b command when things are working, I am able to query the modem using ATI4 and such. But when either it or the port are in this strange state, I get no echo back of characters that I type while in tip. Can anyone recommand a command that I can issue from the Unix prompt to free up the port to avoid having me to call in a help ticket to simply get the modem reset?
 
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LEARN ABOUT DEBIAN

statserial

STATSERIAL(1)							   User Commands						     STATSERIAL(1)

NAME

       statserial - display serial port modem status lines

SYNOPSIS

       statserial [-n |  -d | -x] <device-name>

DESCRIPTION

       Statserial displays a table of the signals on a standard 9-pin or 25-pin serial port, and indicates the status of the handshaking lines. It
       can be useful for debugging problems with serial ports or modems.

       The optional device-name parameter is the full name of the device file for the serial port in question. If not specified,  the  default	is
       taken from the environment variable MODEM if set, otherwise /dev/cua1.

COMMAND-LINE OPTIONS
       Each of the command line options is mutually exclusive.

       -n   Normally  statserial  will loop continuously, updating the status at one second intervals; you can exit using Control-C. The -n option
	    disables looping.

       -d

	    With this option the status of the modem is printed as a decimal number. The bits are encoded as follows (XXX indicates unused bits):

	    +---+---+---+---+---+---+---+---+---+
	    | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
	    +---+---+---+---+---+---+---+---+---+
	    |DSR|RI |DCD|CTS|XXX|XXX|RTS|DTR|XXX|
	    +---+---+---+---+---+---+---+---+---+

       -x   This option is the same as -d, except that the output is in hexadecimal.

BUGS
/LIMITATIONS
       Statserial only works with devices that support the TIOCMGET ioctl.

       You need permission to read the device file.

       The device file may be locked if other applications are using it.

AUTHOR

       Statserial was written by Jeff Tranter (Jeff_Tranter@Mitel.COM), later updated by Frank Baumgart (godot@uni-paderborn.de) and  is  released
       under the conditions of the GNU General Public License.	See the file COPYING and notes in the source code for details.

SEE ALSO

       setserial(8) stty(1)
       /usr/src/linux/drivers/char/serial.c /usr/include/linux/termios.h

Linux								 17 December 1994						     STATSERIAL(1)